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import base64
import subprocess
import sys
from . import JavaScriptInterpreter
from .encapsulated import template
# ------------------------------------------------------------------------------- #
class ChallengeInterpreter(JavaScriptInterpreter):
# ------------------------------------------------------------------------------- #
def __init__(self):
super(ChallengeInterpreter, self).__init__('nodejs')
# ------------------------------------------------------------------------------- #
def eval(self, body, domain):
try:
js = 'var atob = function(str) {return Buffer.from(str, "base64").toString("binary");};' \
'var challenge = atob("%s");' \
'var context = {atob: atob};' \
'var options = {filename: "iuam-challenge.js", timeout: 4000};' \
'var answer = require("vm").runInNewContext(challenge, context, options);' \
'process.stdout.write(String(answer));' \
% base64.b64encode(template(body, domain).encode('UTF-8')).decode('ascii')
return subprocess.check_output(['node', '-e', js])
except OSError as e:
if e.errno == 2:
raise EnvironmentError(
'Missing Node.js runtime. Node is required and must be in the PATH (check with `node -v`).\n\n'
'Your Node binary may be called `nodejs` rather than `node`, '
'in which case you may need to run `apt-get install nodejs-legacy` on some Debian-based systems.\n\n'
'(Please read the cloudscraper README\'s Dependencies section: '
'https://github.com/VeNoMouS/cloudscraper#dependencies.)'
)
raise
except Exception:
sys.tracebacklimit = 0
raise RuntimeError('Error executing Cloudflare IUAM Javascript in nodejs')
# ------------------------------------------------------------------------------- #
ChallengeInterpreter()
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